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Nano Functional Ceramic Lab. 指導教授：王聖璋 博士 報告人: 林恩賢 No.13 2016/7/13 Outline •Introduction •Experimental •Results and discussion 2 Introduction 電池（cell）是藉化學反應或物理變化，於電極間直接產生 電位差，使於一回路通過電流的裝置。 一次電池 Ex: 鹼性電池 鉛蓄電池 汞電池 燃料電池 二次電池 Ex: 鎳鎘電池 鎳氫電池 鋰離子電池 Ex: AFC PEMFC PAFC DMFC 可再生式電池 再生式燃料電池 Experimental Pt and PtIr electrodes S0, S1, S2, S3, and S4 were prepared with different amounts of IrCl3 0, 0.05. 0.15, 0.2, and 0.3 mL. S0 S1 S2 S3 S4 Pt Pt85Ir15 Pt72Ir28 Pt60Ir40 Pt50Ir50 Results and discussion • All the prepared PtIr electrodes possess nanoporous network structures. • As is evident from the images, the titanium substrate is completely covered by PtIr bimetallic particles with sizes of 50–500 nm. • As the reduction continued, the bimetallic particles started forming on top of one another in a compact arrangement forming the nanoporous three-dimensional network structure. •The number of active sites available on the surface of a Pt electrode for hydrogen adsorption and desorption can be determined from the integrated intensity of these peaks. •All four nanoporous PtIr electrodes have a much higher current density than the nanoporous Pt electrode S0 EAS(mC/cm2) s0 s1 s2 s3 S4 18.6 32.9 92.2 104.7 60.3 • First the CO gas was purged into the solution for 600 s to facilitate CO adsorption on the electrode surface, then the electrolyte was purged with pure Ar for 120 s to remove the excess CO from the electrolyte and finally there was a 20 s rest period At time 250 s, the steady-state current densities mA/cm2 S0 13.1 S1 27.6 S2 30.8 S3 55.8 s4 36.3 constant-phase element CPE • The frequency • 40 kHz to 25 mHz. • Rs =uncompensated solution resistance • Rct =the charge transfer resistance • CPE-T and CPE-P, represents the CPE which takes into account methanol adsorption and oxidation. • ORR activity of nanoporous PtIr electrocatalysts. mA /cm2 S0 1.03 S1 1.72 S2 2.43 S3 4.12 S4 3.00,